78326647 has 6 divisors (see below), whose sum is σ = 91114728. Its totient is φ = 67137084.

The previous prime is 78326621. The next prime is 78326653. The reversal of 78326647 is 74662387.

It is a happy number.

It is not a de Polignac number, because 78326647 - 2²³ = 69938039 is a prime.

It is a super-2 number, since 2×78326647² = 12270127260525218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78326747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 799203 + ... + 799300.

It is an arithmetic number, because the mean of its divisors is an integer number (15185788).

Almost surely, 2^78326647 is an apocalyptic number.

78326647 is a deficient number, since it is larger than the sum of its proper divisors (12788081).

78326647 is a wasteful number, since it uses less digits than its factorization.

78326647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598517 (or 1598510 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The square root of 78326647 is about 8850.2342906841. The cubic root of 78326647 is about 427.8614696368.

The spelling of 78326647 in words is "seventy-eight million, three hundred twenty-six thousand, six hundred forty-seven".